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1, 1, 3, 11, 37, 123, 401, 1281, 4023, 12461, 38175, 115939, 349701, 1049063, 3133493, 9327357, 27687947, 82009215, 242473197, 715889685, 2111215763, 6220468653, 18314669783, 53892395679, 158512474561, 466071547105
(list; graph; refs; listen; history; internal format)
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